Molecular polarity has a direct effect on the behavior of molecular compounds. The attractive forces between polar molecules are than those between nonpolar molecules. It therefore takes energy to separate polar molecules from each other, and a polar compound will have a boiling point than a nonpolar compound of similar size.

Stronger

Greater

Higher

Explanation:

Molecules are held together by intermolecular forces. These are forces that act between molecules in a particular state matter. Intermolecular forces depend on the nature of the molecule.

For polar molecules, the intermolecular forces are stronger thus it takes more energy to separate them leading to a higher boiling point of polar molecules irrespective of their molecular mass.

the answer is c.the valence of the atoms combine .